43 lines
1.3 KiB
C++
43 lines
1.3 KiB
C++
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include <mutex>
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#include <rocksdb/env.h>
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#include "port/win/env_win.h"
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namespace rocksdb {
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namespace port {
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// We choose to create this on the heap and using std::once for the following
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// reasons
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// 1) Currently available MS compiler does not implement atomic C++11
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// initialization of
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// function local statics
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// 2) We choose not to destroy the env because joining the threads from the
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// system loader
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// which destroys the statics (same as from DLLMain) creates a system loader
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// dead-lock.
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// in this manner any remaining threads are terminated OK.
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namespace {
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std::once_flag winenv_once_flag;
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Env* envptr;
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};
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}
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Env* Env::Default() {
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using namespace port;
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std::call_once(winenv_once_flag, []() { envptr = new WinEnv(); });
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return envptr;
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}
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}
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